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                    实验简介
            
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        <li class="header">零：前置准备</li>
        
        
    
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                    配环境、跑测试
            
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                    环境配置
            
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                    运行测试样例
            
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                    RISC-V 的工具链使用
            
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        <li class="header">第一个编译器</li>
        
        
    
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                    step1：仅一个 return 的 main 函数
            
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        <li class="chapter " data-level="3.1.1" data-path="../lab1/part1.html">
            
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                    从零开始的 lexer、parser 以及汇编生成
            
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                    词法语法分析工具
            
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                    使用中间码
            
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                    其他
            
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                    ANTLR 使用
            
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                    Visitor 模式
            
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                    IR 简明介绍
            
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                    规范
            
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        <li class="header">常量表达式</li>
        
        
    
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                    step2：一元操作
            
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                    任务概述
            
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                    实验指导
            
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                    规范
            
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                    step3：加减乘除模
            
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        <li class="chapter " data-level="4.2.1" data-path="../lab3/intro.html">
            
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                    任务概述
            
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                    实验指导
            
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                    规范
            
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                    step4：比较和逻辑表达式
            
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        <li class="chapter " data-level="4.3.1" data-path="../lab4/intro.html">
            
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                    任务概述
            
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        <li class="chapter " data-level="4.3.2" data-path="../lab4/guide.html">
            
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                    实验指导
            
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        <li class="chapter " data-level="4.3.3" data-path="../lab4/spec.html">
            
                <a href="../lab4/spec.html">
            
                    
                    规范
            
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        <li class="header">变量和语句</li>
        
        
    
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                    step5：局部变量和赋值
            
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        <li class="chapter " data-level="5.1.1" data-path="part0-intro.html">
            
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                    摘要
            
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        <li class="chapter " data-level="5.1.2" data-path="part1-parse.html">
            
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                    词法语法分析
            
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        <li class="chapter " data-level="5.1.3" data-path="part1-1-task.html">
            
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                    任务
            
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                    代码生成
            
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                    任务
            
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        <li class="chapter " data-level="5.1.6" data-path="summary.html">
            
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                    小结
            
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                    规范
            
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                    step6：if 语句和条件表达式
            
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        <li class="chapter " data-level="5.2.1" data-path="../lab6/part0-intro.html">
            
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                    摘要
            
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        <li class="chapter " data-level="5.2.2" data-path="../lab6/part1-parse.html">
            
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                    词法语法分析
            
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        <li class="chapter " data-level="5.2.3" data-path="../lab6/part1-1-task.html">
            
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                    任务
            
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        <li class="chapter " data-level="5.2.4" data-path="../lab6/part4-codegen.html">
            
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                    代码生成
            
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        <li class="chapter " data-level="5.2.5" data-path="../lab6/part4-1-task.html">
            
                <a href="../lab6/part4-1-task.html">
            
                    
                    任务
            
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        <li class="chapter " data-level="5.2.6" data-path="../lab6/summary.html">
            
                <a href="../lab6/summary.html">
            
                    
                    小结
            
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        <li class="chapter " data-level="5.2.7" data-path="../lab6/spec.html">
            
                <a href="../lab6/spec.html">
            
                    
                    规范
            
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            </ul>
            
        </li>
    

    
        
        <li class="header">块语句和作用域和更多语句</li>
        
        
    
        <li class="chapter " data-level="6.1" >
            
                <span>
            
                    
                    step7：块语句
            
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        <li class="chapter " data-level="6.1.1" data-path="../lab7/part0-intro.html">
            
                <a href="../lab7/part0-intro.html">
            
                    
                    摘要
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.2" data-path="../lab7/part1-parse.html">
            
                <a href="../lab7/part1-parse.html">
            
                    
                    词法语法分析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="6.1.3" data-path="../lab7/part1-1-task.html">
            
                <a href="../lab7/part1-1-task.html">
            
                    
                    任务
            
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        <li class="chapter " data-level="6.1.4" data-path="../lab7/part4-codegen.html">
            
                <a href="../lab7/part4-codegen.html">
            
                    
                    代码生成
            
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        <li class="chapter " data-level="6.1.5" data-path="../lab7/part4-1-task.html">
            
                <a href="../lab7/part4-1-task.html">
            
                    
                    任务
            
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        <li class="chapter " data-level="6.1.6" data-path="../lab7/summary.html">
            
                <a href="../lab7/summary.html">
            
                    
                    小结
            
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        <li class="chapter " data-level="6.1.7" data-path="../lab7/spec.html">
            
                <a href="../lab7/spec.html">
            
                    
                    规范
            
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        <li class="chapter " data-level="6.2" >
            
                <span>
            
                    
                    step8：循环语句
            
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        <li class="chapter " data-level="6.2.1" data-path="../lab8/part0-intro.html">
            
                <a href="../lab8/part0-intro.html">
            
                    
                    摘要
            
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        <li class="chapter " data-level="6.2.2" data-path="../lab8/part1-parse.html">
            
                <a href="../lab8/part1-parse.html">
            
                    
                    词法语法分析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="6.2.3" data-path="../lab8/part1-1-task.html">
            
                <a href="../lab8/part1-1-task.html">
            
                    
                    任务
            
                </a>
            

            
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        <li class="chapter " data-level="6.2.4" data-path="../lab8/part4-codegen.html">
            
                <a href="../lab8/part4-codegen.html">
            
                    
                    代码生成
            
                </a>
            

            
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        <li class="chapter " data-level="6.2.5" data-path="../lab8/part4-1-task.html">
            
                <a href="../lab8/part4-1-task.html">
            
                    
                    任务
            
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        <li class="chapter " data-level="6.2.6" data-path="../lab8/summary.html">
            
                <a href="../lab8/summary.html">
            
                    
                    小结
            
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        <li class="chapter " data-level="6.2.7" data-path="../lab8/spec.html">
            
                <a href="../lab8/spec.html">
            
                    
                    规范
            
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            </ul>
            
        </li>
    

    
        
        <li class="header">函数和全局变量</li>
        
        
    
        <li class="chapter " data-level="7.1" >
            
                <span>
            
                    
                    step9：函数
            
                </span>
            

            
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        <li class="chapter " data-level="7.1.1" data-path="../lab9/part0-intro.html">
            
                <a href="../lab9/part0-intro.html">
            
                    
                    摘要
            
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        <li class="chapter " data-level="7.1.2" data-path="../lab9/part1-parser.html">
            
                <a href="../lab9/part1-parser.html">
            
                    
                    词法语法分析
            
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        <li class="chapter " data-level="7.1.3" data-path="../lab9/part1-1-task.html">
            
                <a href="../lab9/part1-1-task.html">
            
                    
                    任务
            
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        <li class="chapter " data-level="7.1.4" data-path="../lab9/part4-1-cconv.html">
            
                <a href="../lab9/part4-1-cconv.html">
            
                    
                    调用约定
            
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        <li class="chapter " data-level="7.1.5" data-path="../lab9/part4-2-codegen.html">
            
                <a href="../lab9/part4-2-codegen.html">
            
                    
                    代码生成
            
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        <li class="chapter " data-level="7.1.6" data-path="../lab9/part4-3-task.html">
            
                <a href="../lab9/part4-3-task.html">
            
                    
                    任务
            
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        <li class="chapter " data-level="7.1.7" data-path="../lab9/summary.html">
            
                <a href="../lab9/summary.html">
            
                    
                    小结
            
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        <li class="chapter " data-level="7.1.8" data-path="../lab9/spec.html">
            
                <a href="../lab9/spec.html">
            
                    
                    规范
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="7.2" >
            
                <span>
            
                    
                    step10：全局变量
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="7.2.1" data-path="../lab10/part0-intro.html">
            
                <a href="../lab10/part0-intro.html">
            
                    
                    摘要
            
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        <li class="chapter " data-level="7.2.2" data-path="../lab10/part1-parser.html">
            
                <a href="../lab10/part1-parser.html">
            
                    
                    词法语法分析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.2.3" data-path="../lab10/part1-1-task.html">
            
                <a href="../lab10/part1-1-task.html">
            
                    
                    任务
            
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        <li class="chapter " data-level="7.2.4" data-path="../lab10/part4-codegen.html">
            
                <a href="../lab10/part4-codegen.html">
            
                    
                    代码生成
            
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        <li class="chapter " data-level="7.2.5" data-path="../lab10/part4-1-task.html">
            
                <a href="../lab10/part4-1-task.html">
            
                    
                    任务
            
                </a>
            

            
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        <li class="chapter " data-level="7.2.6" data-path="../lab10/summary.html">
            
                <a href="../lab10/summary.html">
            
                    
                    小结
            
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        <li class="chapter " data-level="7.2.7" data-path="../lab10/spec.html">
            
                <a href="../lab10/spec.html">
            
                    
                    规范
            
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            </ul>
            
        </li>
    

    
        
        <li class="header">指针和数组</li>
        
        
    
        <li class="chapter " data-level="8.1" >
            
                <span>
            
                    
                    step11：指针
            
                </span>
            

            
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        <li class="chapter " data-level="8.1.1" data-path="../lab11/part0-intro.html">
            
                <a href="../lab11/part0-intro.html">
            
                    
                    摘要
            
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        <li class="chapter " data-level="8.1.2" data-path="../lab11/typeck.html">
            
                <a href="../lab11/typeck.html">
            
                    
                    类型检查
            
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        <li class="chapter " data-level="8.1.3" data-path="../lab11/part4-codegen.html">
            
                <a href="../lab11/part4-codegen.html">
            
                    
                    代码生成
            
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        </li>
    
        <li class="chapter " data-level="8.1.4" data-path="../lab11/part4-1-task.html">
            
                <a href="../lab11/part4-1-task.html">
            
                    
                    任务
            
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        <li class="chapter " data-level="8.1.5" data-path="../lab11/summary.html">
            
                <a href="../lab11/summary.html">
            
                    
                    小结
            
                </a>
            

            
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        <li class="chapter " data-level="8.1.6" data-path="../lab11/spec.html">
            
                <a href="../lab11/spec.html">
            
                    
                    规范
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="8.2" >
            
                <span>
            
                    
                    step12：数组
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="8.2.1" data-path="../lab12/part0-intro.html">
            
                <a href="../lab12/part0-intro.html">
            
                    
                    摘要
            
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        <li class="chapter " data-level="8.2.2" data-path="../lab12/part4-codegen.html">
            
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                                <section class="normal markdown-section">
                                
                                <h2 id="&#x4EE3;&#x7801;&#x751F;&#x6210;">&#x4EE3;&#x7801;&#x751F;&#x6210;</h2>
<p>&#x4E3A;&#x4E86;&#x80FD;&#x591F;&#x968F;&#x65F6;&#x5BF9;&#x5C31;&#x53D8;&#x91CF;&#x8FDB;&#x884C;&#x4FEE;&#x6539;&#x548C;&#x5F15;&#x7528;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x628A;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x4FDD;&#x5B58;&#x5728;&#x67D0;&#x4E2A;&#x80FD;&#x591F;&#x968F;&#x65F6;&#x8BBF;&#x95EE;&#x7684;&#x5730;&#x65B9;&#xFF0C;&#x5E76;&#x8BB0;&#x4F4F;&#x4ED6;&#x4EEC;&#x7684;&#x786E;&#x5207;&#x4F4D;&#x7F6E;&#x3002;&#x7B80;&#x5355;&#x8D77;&#x89C1;&#xFF0C;&#x6211;&#x4EEC;&#x4F1A;&#x628A;&#x5B83;&#x4EEC;&#x4FDD;&#x5B58;&#x5728;&#x6808;&#x4E0A;&#x3002;</p>
<p>&#x5982;&#x4F55;&#x5728;&#x7F16;&#x8BD1;&#x65F6;&#x77E5;&#x9053;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x7684;&#x4F4D;&#x7F6E;&#x5462;&#xFF1F;&#x7EDD;&#x5BF9;&#x7684;&#x5185;&#x5B58;&#x5730;&#x5740;&#x8981;&#x5230;&#x8FD0;&#x884C;&#x65F6;&#x624D;&#x80FD;&#x786E;&#x5B9A;&#xFF0C;&#x7ED3;&#x5408;&#x6808;&#x5E27;&#x7684;&#x77E5;&#x8BC6;&#xFF0C;&#x7F16;&#x8BD1;&#x65F6;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<code>fp</code>&#x4EE5;&#x53CA;&#x56FA;&#x5B9A;&#x7684;&#x504F;&#x79FB;&#x6765;&#x83B7;&#x53D6;&#x7279;&#x5B9A;&#x53D8;&#x91CF;&#x3002;</p>
<h3 id="&#x5EFA;&#x7ACB;&#x6808;&#x5E27;">&#x5EFA;&#x7ACB;&#x6808;&#x5E27;</h3>
<p>&#x5F53;&#x4E00;&#x4E2A;&#x51FD;&#x6570;(&#x6211;&#x4EEC;&#x79F0;&#x5B83;&#x4E3A;<code>f</code>)&#x8FD4;&#x56DE;&#x65F6;&#xFF0C;&#x5B83;&#x7684;&#x8C03;&#x7528;&#x8005;&#x9700;&#x8981;&#x80FD;&#x591F;&#x63A5;&#x4E0A;&#x5B83;&#x79BB;&#x5F00;&#x7684;&#x5730;&#x65B9;&#x3002;&#x8FD9;&#x610F;&#x5473;&#x7740;&#x5B83;&#x7684;&#x6808;&#x5E27;&#xFF0C;&#x4EE5;&#x53CA;<code>sp</code>&#x548C;<code>fp</code>&#x4E2D;&#x7684;&#x503C;&#xFF0C;&#x90FD;&#x9700;&#x8981;&#x548C;<code>f</code>&#x88AB;&#x8C03;&#x7528;&#x4E4B;&#x524D;&#x5B8C;&#x5168;&#x4E00;&#x6837;&#x3002;&#x88AB;&#x8C03;&#x7528;&#x65F6;&#xFF0C;<code>f</code>&#x9700;&#x8981;&#x505A;&#x7684;&#x7B2C;&#x4E00;&#x4EF6;&#x4E8B;&#x5C31;&#x662F;&#x4E3A;&#x81EA;&#x5DF1;&#x5EFA;&#x7ACB;&#x4E00;&#x4E2A;&#x65B0;&#x7684;&#x6808;&#x5E27;&#xFF0C;&#x4F7F;&#x7528;&#x4E0B;&#x9762;&#x7684;&#x6307;&#x4EE4;(&#x4E0D;&#x59A8;&#x81EA;&#x5DF1;&#x7528; gcc &#x7F16;&#x8BD1;&#x4E00;&#x4E2A;&#x7A0D;&#x590D;&#x6742;&#x7684;&#x7A0B;&#x5E8F;&#xFF0C;&#x770B;&#x770B;&#x7ED3;&#x679C;)&#x3002;</p>
<pre><code>addi sp, sp, -framesize         #&#x5EFA;&#x7ACB;&#x6808;&#x5E27;
sw ra, framesize-4(sp)          #&#x50A8;&#x5B58;&#x8FD4;&#x56DE;&#x5730;&#x5740;&#xFF08;&#x5DF2;&#x7ECF;&#x50A8;&#x5B58;&#x5728; ra &#x4E2D;&#xFF0C;&#x4E3A;&#x4EC0;&#x4E48;&#x518D;&#x6B21;&#x50A8;&#x5B58;&#xFF1F;&#xFF09;
sw fp, framesize-8(sp)        #&#x50A8;&#x5B58; fp
addi fp, sp, framesize          #&#x66F4;&#x65B0; fp
</code></pre><p>&#x8FD9;&#x4E9B;&#x6307;&#x4EE4;&#x79F0;&#x4E3A;&#x51FD;&#x6570;&#x524D;&#x5E8F;&#xFF08;function prologue&#xFF09;&#x3002;&#x76EE;&#x524D;, framesize = &#x53D8;&#x91CF;&#x6570;&#x91CF; * 4 + 8&#xFF08;&#x4E3A;&#x4EC0;&#x4E48;&#xFF1F;&#xFF09;&#xFF0C;&#x6CE8;&#x610F;&#xFF0C;&#x6211;&#x4EEC;&#x6240;&#x6709;&#x7684;&#x53D8;&#x91CF;&#x957F;&#x5EA6;&#x90FD;&#x4E3A;4&#x3002;</p>
<p>&#x5728;<code>f</code>&#x8FD4;&#x56DE;&#x4E4B;&#x524D;&#xFF0C;&#x5B83;&#x7ACB;&#x5373;&#x6267;&#x884C;&#x51FD;&#x6570;&#x524D;&#x5E8F;&#x6765;&#x5220;&#x9664;&#x8FD9;&#x4E2A;&#x6808;&#x5E27;&#xFF0C;&#x8BA9;&#x4E00;&#x5207;&#x90FD;&#x548C;&#x51FD;&#x6570;&#x524D;&#x5E8F;&#x6267;&#x884C;&#x4E4B;&#x524D;&#x4E00;&#x6837;&#x3002;</p>
<pre><code>lw fp, framesize-8(sp)         #&#x6062;&#x590D; fp
lw ra, framesize-4(sp)          #&#x6062;&#x590D; ra
addi sp, sp, framesize          #&#x6062;&#x590D; sp
ret
</code></pre><p>&#x8FD9;&#x88AB;&#x79F0;&#x4E3A;&#x51FD;&#x6570;&#x6536;&#x5C3E;&#xFF08;function epilogue&#xFF09;&#x3002;&#x5230;&#x76EE;&#x524D;&#x4E3A;&#x6B62;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x4E0D;&#x9700;&#x8981;&#x51FD;&#x6570;&#x524D;&#x5E8F;&#xFF08;function prologue&#xFF09;&#x6216;&#x51FD;&#x6570;&#x6536;&#x5C3E;&#xFF08;function epilogue&#xFF09;&#xFF0C;&#x4F46;&#x6DFB;&#x52A0;&#x5B83;&#x4EEC;&#x5C06;&#x51CF;&#x5C11;&#x540E;&#x7EED;&#x9762;&#x5BF9;&#x8DF3;&#x8F6C;&#x548C;&#x51FD;&#x6570;&#x65F6;&#x7684;&#x56F0;&#x96BE;&#x3002;</p>
<p>&#x6709;&#x4E86;&#x8FD9;&#x4E9B;&#x51C6;&#x5907;&#xFF1A;</p>
<ul>
<li>&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5B89;&#x5168;&#x5730;&#x5C06;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x63A8;&#x9001;&#x5230;&#x6808;&#x4E0A;&#xFF0C;&#x800C;&#x4E0D;&#x6539;&#x53D8;&#x8C03;&#x7528;&#x8005;&#x7684;&#x6808;&#x5E27;&#x3002;</li>
<li><strong>&#x53EF;&#x4EE5;&#x5C06;&#x53D8;&#x91CF;&#x4F4D;&#x7F6E;&#x4FDD;&#x5B58;&#x4E3A;<code>fp</code>&#x7684;&#x504F;&#x79FB;&#x91CF;</strong>&#x3002;&#x6211;&#x4EEC;&#x77E5;&#x9053;<code>fp</code>&#x5230;<code>sp</code>&#x4E0A;&#x9762;&#x6CA1;&#x6709;&#x4EFB;&#x4F55;&#x4E1C;&#x897F;&#xFF08;&#x56E0;&#x4E3A;&#x6211;&#x4EEC;&#x5728;&#x51FD;&#x6570;&#x524D;&#x5E8F;&#x4E2D;&#x8BBE;&#x7F6E;&#x4E86;&#x4E00;&#x4E2A;&#x7A7A;&#x7684;&#x5806;&#x6808;&#x6846;&#x67B6;&#xFF09;&#xFF0C;&#x800C;&#x4E14;&#x6211;&#x4EEC;&#x77E5;&#x9053;<code>fp</code>&#x5728;&#x51FD;&#x6570;&#x6536;&#x5C3E;&#x4E4B;&#x524D;&#x4E0D;&#x4F1A;&#x6539;&#x53D8;&#x3002;</li>
</ul>
<p>&#x6211;&#x4EEC;&#x5E94;&#x8BE5;&#x5728;&#x51FD;&#x6570;&#x5B9A;&#x4E49;&#x7684;&#x5F00;&#x59CB;&#x5904;&#x751F;&#x6210;&#x51FD;&#x6570;&#x524D;&#x5E8F;&#xFF0C;&#x5C31;&#x5728;&#x51FD;&#x6570;&#x7684;&#x6807;&#x7B7E;&#x4E4B;&#x540E;&#xFF0C;&#x5E76;&#x5728;&#x51FD;&#x6570;&#x672B;&#x5C3E;&#x751F;&#x6210;&#x51FD;&#x6570;&#x6536;&#x5C3E;&#x3002;</p>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x6539;&#x5199;&#x4E4B;&#x524D;&#x6211;&#x4EEC;&#x7684; RET &#x6307;&#x4EE4;&#xFF0C;&#x5B83;&#x5E94;&#x5F53;&#x8DF3;&#x5230;&#x51FD;&#x6570;&#x6536;&#x5C3E;&#x800C;&#x4E0D;&#x662F;&#x76F4;&#x63A5; ret&#xFF0C;&#x8003;&#x8651;&#x5230;&#x76EE;&#x524D;&#x6211;&#x4EEC;&#x6CA1;&#x6709;&#x5206;&#x652F;&#x6307;&#x4EE4;&#x800C;&#x4E14;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x4E0D;&#x6539;&#x5199;&#x6682;&#x65F6;&#x4E0D;&#x4F1A;&#x4EA7;&#x751F;&#x95EE;&#x9898;&#x3002;</p>
<p>&#x8FD9;&#x6837;&#xFF0C;&#x6211;&#x4EEC;&#x5BF9;&#x4E8E;&#x53D8;&#x91CF;&#x7684;&#x6620;&#x5C04;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x53D8;&#x91CF;&#x76F8;&#x5BF9;&#x4E8E; <code>fp</code> &#x7684;&#x504F;&#x79FB;&#x6765;&#x5EFA;&#x7ACB;&#x3002;&#x73B0;&#x5728;&#x8BA9;&#x6211;&#x4EEC;&#x770B;&#x770B;&#x5982;&#x4F55;&#x5904;&#x7406;&#x53D8;&#x91CF;&#x7684;&#x58F0;&#x660E;&#x3001;&#x8D4B;&#x503C;&#x548C;&#x5F15;&#x7528;&#x3002;</p>
<h3 id="&#x53D8;&#x91CF;&#x58F0;&#x660E;">&#x53D8;&#x91CF;&#x58F0;&#x660E;</h3>
<p>&#x78B0;&#x5230;&#x53D8;&#x91CF;&#x58F0;&#x660E;&#x65F6;&#xFF0C;&#x9700;&#x5C06;&#x53D8;&#x91CF;&#x4FDD;&#x5B58;&#x5230;&#x6808;&#x4E2D;&#x5E76;&#x8BBE;&#x5B9A;&#x5B83;&#x7684;&#x504F;&#x79FB;&#x91CF;&#x3002;&#x4E8B;&#x5B9E;&#x4E0A;&#xFF0C;&#x6211;&#x4EEC;&#x5728;&#x51FD;&#x6570;&#x524D;&#x5E8F;&#x4E2D;&#x7559;&#x4E0B;&#x4E86;&#x53D8;&#x91CF;&#x7684;&#x4F4D;&#x7F6E;&#xFF08;&#x6CE8;&#x610F;&#x6808;&#x5E27;&#x7684;&#x5927;&#x5C0F;&#xFF09;&#xFF0C;&#x4E5F;&#x5C31;&#x9690;&#x5F0F;&#x7684;&#x201C;&#x4FDD;&#x5B58;&#x201D;&#x4E86;&#x53D8;&#x91CF;&#x3002;&#x9996;&#x5148;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x4E00;&#x4E2A;&#x6570;&#x636E;&#x7ED3;&#x6784;&#x6765;&#x7EF4;&#x62A4;&#x53D8;&#x91CF;&#x7684;&#x4FE1;&#x606F;&#xFF0C;&#x5982;&#xFF1A;&#x540D;&#x79F0;&#x3001;&#x7C7B;&#x578B;&#xFF08;lab11&#xFF09;&#x3001;&#x58F0;&#x660E;&#x4F4D;&#x7F6E;&#x3001;&#x521D;&#x59CB;&#x5316;&#x8BED;&#x53E5;&#x7B49;&#x3002;&#x81F3;&#x4E8E;&#x504F;&#x79FB;&#xFF0C;&#x4F60;&#x53EF;&#x4EE5;&#x628A;&#x504F;&#x79FB;&#x76F4;&#x63A5;&#x4F5C;&#x4E3A;&#x53D8;&#x91CF;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x5EFA;&#x7ACB;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x5230;&#x5176;&#x504F;&#x79FB;&#x7684;&#x6620;&#x5C04;&#xFF0C;&#x5173;&#x952E;&#x7684;&#x95EE;&#x9898;&#x662F;&#x504F;&#x79FB;&#x91CF;&#x7684;&#x786E;&#x5B9A;&#x3002;</p>
<p>&#x76EE;&#x524D;&#x9636;&#x6BB5;&#xFF0C;&#x4F60;&#x53EF;&#x4EE5;&#x7B80;&#x5355;&#x7684;&#x4F7F;&#x7528;&#x4E00;&#x4E2A;&#x7B80;&#x5355;&#x7684;&#x94FE;&#x8868;&#x6216;&#x8005;&#x6570;&#x7EC4;&#x6765;&#x4FDD;&#x5B58;&#x5DF2;&#x58F0;&#x660E;&#x53D8;&#x91CF;&#x7684;&#x4FE1;&#x606F;&#x3002;</p>
<h4 id="&#x504F;&#x79FB;&#x91CF;&#x786E;&#x5B9A;">&#x504F;&#x79FB;&#x91CF;&#x786E;&#x5B9A;</h4>
<p>&#x53D8;&#x91CF;&#x7684;&#x504F;&#x79FB;&#x91CF;&#x6709;&#x4E00;&#x79CD;&#x6BD4;&#x8F83;&#x66B4;&#x529B;&#x7684;&#x8BBE;&#x5B9A;&#x65B9;&#x5F0F;&#xFF1A;&#x6BCF;&#x4E00;&#x4E2A;&#x58F0;&#x660E;&#x7684;&#x53D8;&#x91CF;&#x504F;&#x79FB;&#x4F9D;&#x6B21;&#x9012;&#x589E;&#x3002;&#x76EE;&#x524D;&#x6211;&#x4EEC;&#x6CA1;&#x6709;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x8FD9;&#x6837;&#x505A;&#x662F;&#x6CA1;&#x95EE;&#x9898;&#x7684;&#xFF0C;&#x4F46;&#x5728;&#x7B2C;7&#x7AE0;&#x5F15;&#x5165;&#x4F5C;&#x7528;&#x57DF;&#x540E;&#xFF0C;&#x8FD9;&#x79CD;&#x66B4;&#x529B;&#x7684;&#x5B9E;&#x73B0;&#x4F1A;&#x51FA;&#x73B0;&#x4E00;&#x4E9B;&#x95EE;&#x9898;&#x3002;</p>
<blockquote>
<p>&#x53D8;&#x91CF;&#x91CD;&#x590D;&#x58F0;&#x660E;&#x7684;&#x68C0;&#x67E5;&#xFF1A;&#x6BCF;&#x6B21;&#x78B0;&#x5230;&#x751F;&#x547D;&#x5219;&#x68C0;&#x67E5;&#x6709;&#x65E0;&#x540C;&#x540D;&#x53D8;&#x91CF;&#x5DF2;&#x7ECF;&#x58F0;&#x660E;&#x3002;</p>
</blockquote>
<h3 id="&#x53D8;&#x91CF;&#x8D4B;&#x503C;">&#x53D8;&#x91CF;&#x8D4B;&#x503C;</h3>
<h4 id="&#x4EE3;&#x7801;&#x751F;&#x6210;">&#x4EE3;&#x7801;&#x751F;&#x6210;</h4>
<p>&#x76EE;&#x524D;&#x53EA;&#x6709;&#x53D8;&#x91CF;&#x624D;&#x80FD;&#x4F5C;&#x4E3A;&#x5DE6;&#x503C;&#xFF0C;&#x6240;&#x4EE5;&#x8BB0;&#x5F97;&#x68C0;&#x67E5; assign &#x64CD;&#x4F5C;&#x7684;&#x7C7B;&#x578B;&#xFF08;&#x6216;&#x8BB8;&#x4F60;&#x5DF2;&#x7ECF;&#x5728; parser &#x4E2D;&#x8FDB;&#x884C;&#x4E86;&#x68C0;&#x67E5;&#xFF09;&#x3002;&#x56E0;&#x4E3A;&#x6211;&#x4EEC;&#x7684;&#x53D8;&#x91CF;&#x76F8;&#x5F53;&#x4E8E;&#x4E00;&#x4E2A;&#x5730;&#x5740;&#xFF0C;&#x53EF;&#x4EE5;&#x901A;&#x8FC7; <code>sd</code> &#x6307;&#x4EE4;&#x5B8C;&#x6210;&#x53D8;&#x91CF;&#x8D4B;&#x503C;&#x3002;</p>
<pre><code>visitAssign(Node assign) {
    visit(assign.rhs);                  //&#x8BA1;&#x7B97;&#x53D8;&#x91CF;&#x503C;&#xFF0C;&#x7ED3;&#x679C;&#x538B;&#x5165;&#x6808;&#x4E2D;
    emitStore(assign.lhs.offset);       //&#x8FDB;&#x884C;&#x8D4B;&#x503C;
}
</code></pre><p><code>void emitStore(int offset)</code> &#x751F;&#x6210;&#x5982;&#x4E0B;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code class="lang-asm">lw t0, 0(sp)
addi sp, sp, 4                     #pop &#x53D8;&#x91CF;&#x503C;                   
sw t0, 4*{offset}(fp)              #&#x53D8;&#x91CF;&#x8D4B;&#x503C;
addi sp, sp, -4
sw t0, 0(sp)                       #push &#x53D8;&#x91CF;&#x503C;&#xFF0C;&#x56E0;&#x4E3A; assign &#x8BED;&#x53E5;&#x662F;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x7684;
</code></pre>
<p>&#x663E;&#x7136;&#xFF0C;&#x8FD9;&#x6BB5;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x4F18;&#x5316;&#xFF0C;&#x4E0D;&#x505A;&#x8D58;&#x8FF0;&#x3002;</p>
<blockquote>
<p>&#x6CE8;&#x610F;&#xFF0C;assign &#x8BED;&#x53E5;&#x5B58;&#x5728;&#x8FD4;&#x56DE;&#x503C;&#xFF0C;&#x4E5F;&#x5C31;&#x4F1A;&#x6700;&#x7EC8;&#x5728;&#x6808;&#x4E2D;&#x7559;&#x4E0B;&#x4E00;&#x4E2A;&#x503C;&#x3002;
&#x56E0;&#x6B64;&#xFF0C; <code>a = 0;</code> &#x8BED;&#x53E5;&#x4F1A;&#x7ED9; <code>a</code> &#x8D4B;&#x503C;&#x5E76;&#x5728;&#x6808;&#x4E2D;&#x7559;&#x4E0B;&#x4E00;&#x4E2A; <code>0</code>&#xFF0C;&#x5FC5;&#x987B;&#x5C06;&#x8FD9;&#x4E2A;&#x591A;&#x4F59;&#x7684;&#x503C;&#x5F39;&#x51FA;&#x3002;
\<statement\> ::= \<expr\> &quot;;&quot; &#x7C7B;&#x578B;&#x7684; statement &#x90FD;&#x5B58;&#x5728;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#x3002;</expr\></statement\></p>
</blockquote>
<h3 id="&#x53D8;&#x91CF;&#x5F15;&#x7528;">&#x53D8;&#x91CF;&#x5F15;&#x7528;</h3>
<p>&#x8981;&#x5F15;&#x7528;&#x8868;&#x8FBE;&#x5F0F;&#x4E2D;&#x7684;&#x53D8;&#x91CF;&#xFF0C;&#x53EA;&#x9700;&#x5C06;&#x5176;&#x4ECE;&#x5806;&#x6808;&#x4E2D;&#x590D;&#x5236;&#x5230;&#x6808;&#x9876;&#x5373;&#x53EF;&#xFF1A;</p>
<pre><code>visitVar(Node var) {
    emitLoad(var.offset);
}
</code></pre><p>emitLoad(var.offset)&#xFF1A;</p>
<pre><code class="lang-asm">lw t0, 4*{offset}(fp)           #&#x53D6;&#x53D8;&#x91CF;&#x7684;&#x503C;
addi sp, sp, 4
sw t0, 0(sp)                    #push&#x5230;&#x6808;&#x9876;
</code></pre>

                                
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